Open beta · Free for solo devs

Design backends
like a senior architect.
Ship with confidence.

Visual canvas, constraint-aware AI, real-time multi-cloud pricing, and architecture health scoring — all in one collaborative workspace for backend teams.

Start designing free →View live demo
No credit card
3 free diagrams
SSO with GitHub or Google
Ride-sharing Backend · v4
⬡ 74$847/mo
CLIENTmobile / webAPI GATEWAYrate limit · authAUTH SERVICEJWT · OAuthUSER SERVICEprofiles · prefsORDER SERVICErides · trackingPOSTGRESQLRDS · t3.largeREDIS CACHEElastiCacheSQS QUEUEasync jobs!⚠ No DLQ configured
AI Assistantclaude
Design ride-sharing backend for 10k users
BackArch AI
Foundation laid. Your SQS has no DLQ — at 10k req/s you'll lose ~0.1% of messages.
Suggestion
Add circuit breaker between Order → PostgreSQL. Apply →
Monthly Cost
☁ AWS$847
☁ GCP$743
☁ Azure$921
Visual Canvas

The canvas backend
teams have been missing.

Drag, connect, and reason about your system visually. Every component — API gateways to vector DBs — ships pre-wired with correct connection semantics.

40+ componentsTyped connectionsAuto-save + versioning
CLIENTAPI GATEWAYKong · rate limitAuthUsersOrdersPGprimaryComponents+ Lambda+ Kafka
Constraint-First AI

AI that actually understands
your constraints.

Set your budget, cloud preference, traffic, and compliance posture. The AI never suggests $2k/mo Kafka when you're on a $500 budget.

Claude Sonnet-poweredDiagram-aware contextOne-click mutations
BackArch AIclaude-sonnet
☁ AWS💰 $500–2k/mo⚡ 1k req/s👥 3 eng
Add async queue between orders and fulfillment
BackArch AI
Given your $500–2k budget, I'd recommend SQS FIFO(~$24/mo) over Kafka (~$350/mo). I'll add a DLQ and Lambda consumer to keep you serverless.
Architecture Health

Your architecture score,
live as you build.

Every change updates a real-time 0–100 score across resilience, security, scalability, and cost efficiency.

0
/ 100
SPOF detection
Flags services with no redundancy
Missing circuit breakers
Detects unprotected service calls
No DLQ on queues
Your SQS has no dead-letter queue
Observability coverage
Checks for metrics, logs, traces
Auth layer present
Verifies auth on public endpoints
Budget compliance
Flags components over your limit
Design Patterns

Battle-tested patterns,
built right in.

Apply proven patterns in one click. The canvas annotates them visually and explains tradeoffs inline.

40+
Patterns
5
Categories
1-click
Apply to canvas
AI
Tradeoff analysis
⚡
Resilience
Circuit Breaker
Stop cascade failures by halting calls to degraded services automatically.
Medium
🔀
Scalability
CQRS
Separate read and write models for independent, elastic scaling.
Hard
📬
DataDistributed
Saga Pattern
Coordinate distributed transactions across microservices without 2PC locks.
Hard
🛡
Networking
API Gateway
Single entry point for all client-to-service communication with auth and rate limiting.
Easy
📊
StateAudit
Event Sourcing
Persist state as an immutable event log for full auditability and time-travel.
Hard
🔄
Resilience
Retry + Backoff
Exponential backoff with jitter for graceful transient-fault recovery.
Easy
Browse all 40+ patterns  →
Live Multi-Cloud Pricing

Know the real cost
before you provision anything.

Every component you place gets a live price tag sourced from AWS, GCP, and Azure APIs — refreshed weekly. Zero spreadsheets.

1,008
Pricing records
3
Cloud providers
Weekly
Price refresh
50+
Service types
AWS
Amazon AWS
$847/mo
↑ $104 vs GCP
EC2 t3.large$168
RDS PostgreSQL$384
ElastiCache$165
SQS + Lambda$130
CHEAPEST
GCP
Google Cloud
$743/mo
↓ saves $1,248/yr
Compute n2$142
Cloud SQL$348
Memorystore$143
Pub/Sub + Run$110
AZ
Microsoft Azure
$921/mo
↑ $178 vs GCP
VM D2s v3$191
Azure SQL$412
Azure Cache$178
Service Bus$140
Monthly spend — ride-sharing backend
AWS
$847
$847
GCP
$743
$743
Azure
$921
$921
AI model pricing
claude-sonnet-4-6Recommended$3 / $15 MTok
claude-haiku-4-5Fastest$0.80 / $4 MTok
gpt-4oOpenAI$2.50 / $10 MTok
gemini-2.0-flashGoogle$0.10 / $0.40 MTok
✦
BackArch AI: Switching this stack from AWS to GCP saves $104/mo ($1,248/yr) with near-zero migration cost — same managed services, different billing. Apply to canvas to see the updated diagram.
See subscription plans →Explore pricing explorer
Real-time Collaboration

Your whole team,
on the same canvas.

See teammates' cursors, selections, and edits live. Built on Y.js CRDTs — no merge conflicts, no lock contention. Just flow.

Y.js CRDT engineLive presence cursorsMultiplayer awareness
AKSRJM3 collaborators · liveAPI GatewayKongUser ServicePostgreSQLAlexSamJordanRedis Cache
Pricing

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✓10 AI messages / day
✓Live pricing sidebar
✗Collaboration
✗ADR generator
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For solo developers who need unlimited power.
✓Unlimited diagrams
✓Unlimited AI
✓Health score
✓Pattern library
✗Collaboration
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Architecture clarity
in 2 minutes.

Start from a template or let the AI generate your first architecture.
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Free forever · 3 diagrams · SSO with GitHub or Google